Well that didn't solve my problem with the leaking tank (it just keeps draining after the trigger is pulled). Looks like my problem was actually a sticky trigger, but I was hoping for a $4 fix. I used mine on a large green car I bought here at Revain two years ago. The installation took maybe a minute in total. Unscrew one cap and screw on a new one. I'll try the second part Bissell suggested, maybe the problem is in the FAQ. While this didn't solve my problem, it's a good part to have on hand.